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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <map>
#include <memory>
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "components/leveldb_proto/public/proto_database.h"
#include "media/base/media_export.h"
#include "media/base/video_codecs.h"
#include "media/capabilities/video_decode_stats_db.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class VideoDecodeStatsDBProvider;
// The in-memory database disappears with profile shutdown to preserve the
// privacy of off-the-record (OTR) browsing profiles (Guest and Incognito). It
// also allows the MediaCapabilities API to behave the same both on and
// off-the-record which prevents sites from detecting when users are OTR modes.
// VideoDecodeStatsDBProvider gives incognito profiles a hook to read the stats
// of the of the originating profile. Guest profiles are conceptually a blank
// slate and will not have a "seed" DB.
class MEDIA_EXPORT InMemoryVideoDecodeStatsDBImpl : public VideoDecodeStatsDB {
// |seed_db_provider| provides access to a seed (read-only) DB instance.
// Callers must ensure the |seed_db_provider| outlives this factory and any
// databases it creates via CreateDB(). |seed_db_provider| may be null when no
// seed DB is available.
explicit InMemoryVideoDecodeStatsDBImpl(
VideoDecodeStatsDBProvider* seed_db_provider);
~InMemoryVideoDecodeStatsDBImpl() override;
// Implement VideoDecodeStatsDB.
void Initialize(InitializeCB init_cb) override;
void AppendDecodeStats(const VideoDescKey& key,
const DecodeStatsEntry& entry,
AppendDecodeStatsCB append_done_cb) override;
void GetDecodeStats(const VideoDescKey& key,
GetDecodeStatsCB get_stats_cb) override;
void ClearStats(base::OnceClosure destroy_done_cb) override;
// Called when the |seed_db_provider_| returns an initialized seed DB. Will
// run |init_cb|, marking the completion of Initialize().
void OnGotSeedDB(base::OnceCallback<void(bool)> init_cb,
VideoDecodeStatsDB* seed_db);
// Passed as the callback for |OnGotDecodeStats| by |AppendDecodeStats| to
// update the database once we've read the existing stats entry.
void CompleteAppendWithSeedData(const VideoDescKey& key,
const DecodeStatsEntry& entry,
AppendDecodeStatsCB append_done_cb,
bool read_success,
std::unique_ptr<DecodeStatsEntry> seed_entry);
// Called when GetDecodeStats() operation was performed. |get_stats_cb|
// will be run with |success| and a |DecodeStatsEntry| created from
// |stats_proto| or nullptr if no entry was found for the requested key.
void OnGotSeedEntry(const VideoDescKey& key,
GetDecodeStatsCB get_stats_cb,
bool success,
std::unique_ptr<DecodeStatsEntry> seed_entry);
// Indicates whether initialization is completed.
bool db_init_ = false;
// Lazily provides |seed_db_| from original profile. Owned by original profile
// and may be null.
VideoDecodeStatsDBProvider* seed_db_provider_ = nullptr;
// On-disk DB owned by the base profile for the off-the-record session. For
// incognito sessions, this will contain the original profile's stats. For
// guest sessions, this will be null (no notion of base profile). See
// |in_memory_db_|.
VideoDecodeStatsDB* seed_db_ = nullptr;
// In-memory DB, mapping VideoDescKey strings -> DecodeStatsEntries. This is
// the primary storage (read and write) for this class. The |seed_db_| is
// read-only, and will only be queried when the |in_memory_db_| lacks an
// entry for a given key.
std::map<std::string, DecodeStatsEntry> in_memory_db_;
// Ensures all access to class members come on the same sequence. API calls
// and callbacks should occur on the same sequence used during construction.
// LevelDB operations happen on a separate task runner, but all LevelDB
// callbacks to this happen on the checked sequence.
base::WeakPtrFactory<InMemoryVideoDecodeStatsDBImpl> weak_ptr_factory_;
} // namespace media